Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf00b45f3fc2565…

MALICIOUS

PDF

70.5 KB Created: 2021-03-16 10:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196ca645c1a779b34cbef93a5160bb1a SHA-1: 5c16606d6f80ef21436ce3f6f4d24997b78287b2 SHA-256: acf00b45f3fc25655c39440d9fab8c98a78412abdd7b8518b965342a945630ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many of which are likely part of an SEO farm or redirection scheme, with one specific URL being https://bologen.ru/award?keyword=fisica+para+la+ciencia+y+tecnologia+volumen+1+pdf. The document body is heavily obfuscated and unreadable, preventing a detailed analysis of its specific lure, but the presence of numerous external links suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/award?keyword=fisica+para+la+ciencia+y+tecnologia+volumen+1+pdf
    • https://cdn.sqhk.co/gajerivab/i3YHii0/zujutat.pdf
    • http://eagleaff.com/poxibejid35ro2.pdf
    • https://cdn.sqhk.co/vujaderaz/cgeLijh/81137952746.pdf
    • http://podarokinsta24.online/9870299837chzwi.pdf
    • http://werisafijorarit.iblogger.org/hasi_ke_chutkule_video_mein.pdf
    • https://cdn.sqhk.co/wikaraxixi/FXgi2gh/translate_japanese_to_english_characters.pdf
    • http://spain50off.info/tutorialspoint_json_editorszq82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nijosinizo/68579399821.pdf
    • https://s3.amazonaws.com/zuwimadaneb/tovidakezamajubez.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_3b282c5cc5b1428ebb60209527735152.pdf?index=true
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_273347259a9a49f5ad6a99da57118478.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_9f6df8db512b4d47aabe1b8fa326e5b7.pdf?index=true
    • http://zapizuw.rf.gd/nujipojijibat.pdf
    • http://fexajorijoworas.epizy.com/66860440694.pdf
    • https://s3.amazonaws.com/juvosi/bacteria_vs_virus_worksheet.pdf
    • https://s3.amazonaws.com/tejuvonixag/shumaila_kosar_naat_hasbi_rabbi_video.pdf
    • https://s3.amazonaws.com/legenapi/dd_gods_of_light.pdf
    • http://dipusoxitiruvu.rf.gd/g35_transmission_fluid_location.pdf
    • https://s3.amazonaws.com/ruzaganog/topavevukaminonisu.pdf
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_314d9fc599a64129917885424990db1a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d206.bin
55534e1e01326561eaa0871ecd9a1bc865ef3bb56f11a66aad938e9a0bcbfba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 5644 bytes
font_01_sfnt_off0000e542.bin
0956ff104ade4e712cd630a1bd9422c7e930d15d617750aacfec62a1c3a38bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 11484 bytes

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